Metallic propeller with adjustable pitch and detachable blades



" Oct. 12 1926. 1,602,755

G. DELAGE METALLIC PROPELLER WITH ADJUSTABLE PITCH AND DETACHABLE BLADES Filed March 20, 1925 2 Sheets-Sheet 1 Fig.1

Oct. 12

G. DELAGE METALLIC PROPELLER WITHADJUSTABLE PITCH AND DETAGHABLE BLADES File i March 20, 1925 2 Sheets-Sheet 2 Fig.5

Fig.1

Patented Oct. 12, 1926.

UNITED STATES PATENT OFFICE. I

GUST-AVE DELAGE, CF PARIS, FRANCE, .ASSIGHOR TO SOCE'IE ANONYME NIEUPORT ASTRA, 0F ISSY-LES-MOULINEAUX, FRANCE, A FRENCH COMPANY.

METALLIC PRCPELLER WITH ADJUSTABLE PITCH AND- DETACHABLE BLADES- Applieation filed larch 20, 1925, Serial No. 17,048, and in France May 30, 1924.

The present invention has. for object a metallic propeller, the detachable blades of which are formed by cylindrical surfaces without torsion. This propeller is more particularly characterized in that the blades are provided, on their'straight section, with a hooking heel-piece engaging into a corresponding diametral mortice provided on one of the cheeks of the hub assembling them; the relative positions of the blades being defined by means of. rin having concentric or eccentric surfaces w ich fit on an axial trunnion of the hub and engage into corresponding recesses provided on the booking edges of the blades.

In the accompanying drawings and by way of exam le:

Figs. 1 an 2 illustrate, in perspective one of the blades of the propeller and one of the checks of the hub.

Fi 3 is a vertical section showing the assemb age of the blades with the checks of the hub.

Figs. 4 and 5 are an elevation and plan view showing how the pitch of the blades can be modified by altering the shape of the ring keying them relatively to the hub.

As indicated in the foregoing, the metallic pro eller is constituted by two cylindrical la es a, that is to say these blades have rectilinear generatrices and semi-circular directrices. The straight sections, adapted to be juxta osed, are respectivel provided with a hoohin heel-piece b. n the case illustrated by i 1,'this heel-piece b is directed towards t e e'xtrados of the blade, but it might project on the intrados or form the horizontal branch ofa .L at the corre sponding ortion of the blade a.

These b ades a are assembled together and connected to the shaft which must drive them in rotation by a hub. This hub is constituted by two cheeks c, d, both having on either one or the other, a diametral mortice e capable of receiving the hooking .heelpiece I) of the blades a. Their faces are so shaped as .to fit against the corresponding faces. of the blades a which they embrace between them. v

The inner cheek c has an axial trunnion e on which is centered the other cheek d and the blades a have, on their edges provided with the hooking heel-pieces b, cylindrical recesses f the radius of which is greater than that of the trunnion e. In the h are concentric.

other, of cylindrical case illustrated, a nut g secured on the trunmen (2 completes the assemblage.

For relatively securing the blades a, on the trunnion e is fitted a ring-shaped key h the outer surface of which engages'with the recesses f provided in the two blades (1.

In the constructional modification of Fig. 4, the outer and inner surfaces of the key The form of construction of Fig. 5 shows that by providing a ring it the outer walls of which are out of center relatively to its bore, it is possible to produce a relative angular displacement of the blades (1, this determining a variation of the angle of incidence, or, in other words, of the pitch.

It is obvious that for a determined typeof propeller to the cylindrical recesses 7' formed in the edges of the blades (1 there might be substituted recesses ca able of adapting themselves to elliptical eye the axis of symmetry of which is in the bearing plane of the hooking ledges b of the said lades. I In the same way, the outer surfaces of the keys 7:. might not be cylindrical surfaces. They might, for instance, also comprise tenons fitting in corresponding mortices provided in the blades a.

To sum u in the system, the blades a are rendere ri id by their hooking heelpieces I) with t e hub, the central key h which supports the latter fixing the relative positions of the blades (1.

The diameter of the propeller might also be varied by forming, on the cheek or cheeks of the hub, several mortices e, or by giving to the mortice e, a width reater than that of the two heel-pieces b. T e lacing in position of the latter would then e effected by means of intermediate wedges.

What I claim as m invention, anddesire to secure by Letters atent is 1. In a metallic propeller for aeronautics,

the arrangement in alignment with each other, of cylindrical blades,pro ect ng heel-pieces provided on the corresponding straight sections of the sa1d blades,and means for connecting together the said heelpieces and the blades.

2. In a metallic propeller for aeronautics, the arrangement, in alignment with each provided on the corresponding straight sections of the said blades and prqectmg relaades,-rheel-pieces tively to their outer cylindrical surface,- an outer cheek having a cylindrical concave surface fitting on the outer cylindrical surface of the blades,w-grooves 1n the said cylindrical concave surface for receiving the heelpieces of the blades.

3. In a metallic propeller for aeronautics, the arrangement, in alignment with each other, of cylindrical 'blades,-heel-pieces provided on the corresponding straight sec, tions of the said blades and projecting relatively to their outer cylindrical surface,' an outercheek having a cylindrical concave surface fitting on the outer cylindrical surface of the blades, grooves in the said cylindrical concave-surface for receivin the heelpieces of the blades, an inner chee ,-a convex cylindrical surface, fitting on the outer cylindrical surface of the blades,means for assembling together the said cheeks constituting, the hub.

4. In a metallic propeller for aeronautics; the arrangement, in alignment with each other, of cylindrical b1ades,heel-pieces provided on the corresponding straight sections of the said blades and projecting relatively to their outer cylindrical surface,-an

, outer cheek having a cylindrical concave surface fitting on the outer cylindrical surface )f the blades,grooves in the said cylindrical concave surface for receiving the heel-pieces of the blades an inner cheek,-a convex cylindrical surface, fitting on the outer -c lindrical surface of the blades,-an axis rigid with the inner cheek for centering the outer cheek and securing it,-circular notches provided at the.base of the blades for permitting the passage of the said assembling axis.

5.-In a metallic propeller for aeronautics, the arrangement, in alignment with each other, of cylindrical lades,-heel-pieces provided on the corresponding straight sections of the said blades and projecting rela- -rendering the cheeks ri drical concave surface for receivin tively to their outer cylindrical surface,-an outer'cheek having a cylindrical concave surface fitting on the outer cylindrical surface of the blades,-grooves in the said cylin drical concave surface for receiving the heelpieces of tli: blades,-an inner cheek,--a convex cylindrical surface, fitting onthe outer cylindrical surface of the blades,-an axis rigid with the inner cheek for centering the outer cheek and securing it,-circular notches provided at the base of the blades for permitting the passage of the said as sembling axis,-the diameter of these notches being greater than of the axis id together,-and means for centering the lades relatively to the said axis.

6. In a metallic propeller for aeronautics, the arrangement, in alignment with each other, of cylindrical blades,-heel-pieces provided on the corresponding straight sec tions of the said blades and projecting relatively to their outer cylindrical surfa'ce,-an outer cheek having a cylindrical concave surface fitting on the outer cylindrical surface of the blades,gr0oves in the said cylinthe heelpieces of the blades,-an inner chee ,-a convex cylindrical surface, fitting on the outer cylindrical surface of the blades,-an axis .rigid with the inner cheek for centering the outer cheek and securing it,-circular notches provided at the base of the blades for permitting the passage of the said assembling axis, the diameter of these notches being greater than that of the axis rendering the cheeks rigid together,-cams fitting between the said axis and the notches of the blades for effecting the adjustment of the pitch of the latter.

In testimony whereof I have signed my name to this specification.

GUSTAVE DELAGE. 

